PRODUCTION OF COARSE PARTICLE OF POROUS LITHIUM ALUMINATE

摘要

PURPOSE:To obtain coarse particles of the subject compound useful as a reinforcing material of electrolyte plate of a fused carbonate fuel cell by bonding a small number of silica particles and a large number of alumina particles to obtain coarse particles, heating the coarse particles in a carbonate containing Li<+> and cooling the product. CONSTITUTION:Coarse particles are produced by bonding a small number of silica particles and a large number of alumina particles. The coarse particles are heated at 500-1000 deg.C in a carbonate containing lithium ion. The silica particles in the coarse particle are dissolved into the carbonate by this treatment to form voids. The coarse alumina particles having voids and produced by this process are lithiated to obtain coarse particles of lithium aluminate. The objective coarse particle of porous lithium aluminate can be produced by cooling the obtained coarse particles of lithium aluminate. When the coarse particle is used as a reinforcing material of an electrolyte plate, a carbonate as an electrolyte is intruded into the void and solidified as it is at the cooling of the fuel cell to connect the carbonate entered into the void to the carbonate around the reinforcing material and, accordingly, the formation of continuous gaps around the reinforcing material can be prevented.